Buckling of a functionally graded coating with an embedded crack bonded to a homogeneous substrate

Sami El-Borgi, W. Aloulou, A. Zghal

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

In an attempt to simulate buckling of nonuniform coatings, we consider the problem of an embedded crack in a functionally graded coating bonded to a homogeneous substrate subjected to a compressive loading. The coating is graded in the thickness direction and the material gradient is orthogonal to the crack direction which is parallel with the free surface. The loading consists of a uniform compressive strain applied away from the crack region. The graded coating is modeled as a nonhomogeneous medium with an isotropic stress-strain law. Using a nonlinear continuum theory and a suitable perturbation technique, the plane strain problem is reduced to an eigenvalue problem describing the onset of buckling. Using integral transforms, the resulting plane elasticity equations are converted analytically into singular integral equations which are solved numerically to give the critical buckling strain and the corresponding crack opening displacement shapes. The main objective of the paper is to study the influence of material nonhomogeneity on the buckling resistance of the graded layer for various crack positions and coating thicknesses.

Original languageEnglish
Pages (from-to)137-150
Number of pages14
JournalInternational Journal of Fracture
Volume142
Issue number1-2
DOIs
Publication statusPublished - Nov 2006
Externally publishedYes

Fingerprint

Buckling
Coating
Crack
Substrate
Cracks
Coatings
Substrates
Plane Elasticity
Perturbation techniques
Perturbation Technique
Plane Strain
Singular Integral Equation
Integral Transform
Free Surface
Integral equations
Eigenvalue Problem
Elasticity
Continuum
Gradient

Keywords

  • Buckling
  • Functionally graded coating
  • Instability load
  • Nonlinear continuum theory
  • Perturbation technique
  • Singular integral equations

ASJC Scopus subject areas

  • Computational Mechanics
  • Mechanics of Materials

Cite this

Buckling of a functionally graded coating with an embedded crack bonded to a homogeneous substrate. / El-Borgi, Sami; Aloulou, W.; Zghal, A.

In: International Journal of Fracture, Vol. 142, No. 1-2, 11.2006, p. 137-150.

Research output: Contribution to journalArticle

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